Drill steel guide



J. L. REILLY DRILL STEEL GUIDE Dec. 31, 1935.

Filed Dec. 22, 1935 Patented Dec. 31, 1935 DRILL STEEL GUIDE John L. Reilly, Claremont, N. H., assignor to Sullivan Machinery Company, a corporation of Massachusetts Application December 22, 1933, Serial No. 703,577

7 Claims.

This invention relates to guides for drilling implements, and more particularly to a guide for drill steels used in hammer rock drills for cutting away the rock partitions between adjacent drill holes.

An object or" this invention is to provide an improved guide for rock cutting implements. Another object is to provide an improved broaching guide for the drill steel of a hammer rock drill. A further object is to provide an improved guide for the drill steel of a hammer rock drill for guiding the steel during the cutting away of the rock partitions between adjacent drill holes during a broaching operation. These and other objects will, however, hereinafter more fully appear in the course of the following description, and as more particularly pointed out in the appended claims.

In the accompanying drawing there is shown 0 for purposes of illustration one form which the invention may assume in practice.

In this drawing,-

Fig. 1 is an elevational view of a broaching type hammer rock drill mounted in drilling position and having associated therewith the im proved drill steel guide.

Fig. 2 is a vertical sectional view showing the illustrative form of the improved guide.

Fig. 3 is a cross sectional view taken on line s-3 of Fig. 2.

Fig. 4 is a cross sectional view taken on line 44 of Fig. 2.

In this illustrative construction the improved drill steel guide generally designated I is shown associated with a hammer rock drill generally designated 2. The rock drill is herein of the mounted type and generally comprises a pressure fluid actuated hammer motor 3 for percus- 40 sively actuating a usual rock drill steel 4. The hammer motor 3 is guided on parallel feed cylinders 5, 5 of a pneumatic feeding motor herein having projecting piston rods 6 connected by a transverse member 1 in turn connected by a rod 8 to the rear end of the hammer motor. The feed cylinders are supported on a swivel trunnion 9 in turn mounted within a clamp I0 secured to a horizontal support ll. Pressure fluid is supplied to the hammer and 0 feed motors through a usual hose connection l2 and through the drill steel 4, which herein is made hollow at It, to the bottom of the drill hole to blow away the cuttings from the hole. As the rock drill disclosed herein is of a stand- 55 ard design and does not per se enter into this invention, further description of the detail structure of the same is herein deemed unnecessary. In drilling in accordance with the broaching method in quarries with a rock drill of the type disclosed a series of closely adjacent holes M are 5 drilled in line in the rock, the holes being separated by relatively thin walls or partitions l5, sometimes termed cores. After the holes are drilled these walls or partitions are drilled or broken away thereby to form a narrow elongated slot in the rock. In the present instance an improved guide is provided for guiding the drill steel i in the desired path during the drilling or breaking away of these hole-separating walls or partitions and the improved guide herein comprises a frame having cylindrical guide portions IE, l6 arranged in parallel side by side relation and substantially fitting two adjacent holes l4 and having an intermediate connecting frame portion ll herein arcuately formed to closely embrace the drill steel 4 and forming the inner portion of a lateral or open-sided slot l8 whereby the guide may be placed laterally in position with respect to the drill steel. The internal faces of the depending portions of the cylindrical guides 96, I6 are slotted at 19 to form a central guide opening 20 for receiving the cutting bit 2! of the drill steel 4, the outer surfaces of the wings 22 of the cutting bit being, guided within the slots i9, thereby to maintain the drill steel centered between the cylindrical guide portions IE, IS. The transverse frame portion ll, that is, the U-shaped part of the guide frame which closely embraces the steel also provides means engageable with the cutting bit so when the steel is withdrawn from the drill hole the last means engages the bit to move the guide with the steel, the guide being hung on and supported by the steel during such withdrawal. Each of the guide portions l6, I6 is 40 provided with a longitudinal bore 23 so that as the fluid flows through the bore I3 in the drill steel to the bottom of the drill hole, the cuttings may be blown from the hole past the guide through the openings 23, 23. The cylindrical guide portions It, It substantially fitting the adjacent drill holes l4, 14 provide a substantial bearing surface for the drill steel and the guide, as the drill steel is fed inwardly, and will maintain the steel in coaxial alinement with the rock drill and midway between the adjacent drill holes so that the cutting bit of the steel will be fed in a straight path thereby to effectively break away the separating wall or partition between the adjacent drill holes.

As a result of this invention, it will be noted that an improved drill steel guide is provided which may be readily attached in guiding position with respect to a drill steel and having a plurality of cylindrical guiding portions fitting two adjacent holes whereby a substantial bearing surface is provided to maintain the drill steel in the desired path. It will further be noted that the improved guide is of an extremely simple and rugged design, which may be manufactured at a minimum of expense and applied to a rock drill steel of a standard design. These and other uses and advantages of the improved guide will be clearly apparent to those skilled in'flthe art.

While there is in this application specifically described one form which the invention may assume in practice, it will be understood that this form of the same is shown for purposes of illustration and that the invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

1. A drill steel guide comprising cylindrical guide portions arranged in parallel relation for slidingly guiding the enlarged cutting end of a drill steel interposed therebetween, and an intermediate yoke-shaped connecting frame extending between said guide portions and embracing the drill steel shank, said connecting frame formed to hang on the enlarged cutting end of the steel guided by and between said guide portions and said connecting frame being formed with an open side to permit lateral sidewise removal of the guide from the drill steel shank.

2. A drill steel guide comprising cylindrical guide portions arranged in parallel relation for slidingly guiding the enlarged cutting end of a drill steel interposed therebetween, and an intermediate yoke-shaped connecting frame extending between said guiding portions and embracing the drill steel shank, said connecting frame formed to hang on the enlarged cutting end 01 the steel guided by and between said guide portions and said connecting frame being formed with an open side to permit lateral sidewise removal of the guide from the drill steel shank, said guide portions having openings extending therethrough for discharging the cuttings from the hole drilled by the drill steel.

3. A guiding tool for use in a boring operation, comprising cylindrical guide portions arranged in parallel side by side relation in a manner to be positioned in parallel bored holes, and a yoke extension formed integral with and extending between said cylindrical guide portions for engaging the shank of a reciprocating hammer drill steel arranged between said cylindrical guide portions and used in boring an adjacent overlapping hole intermediate said parallel holes for cutting the separating core between said parallel bored holes, said yoke being open at one side whereby the drill steel and tool are used together without passing the drill steel in an endwise direction through the tool, and permitting lateral sidewise removal of the tool from the drill steel shank.

e. A guiding tool for use in a boring operation, comprising cylindrical guide portions arranged in parallel side by side relation in a manner to be positioned in parallel bored holes, and a yoke extension formed integral with and extending between said cylindrical guide portions for engaging the shank of a reciprocating hammer drill steel arranged between said cylindrical guide portions and used in boring an adjacent overlapping hole intermediate said parallel holes for cutting the separating core between said parallel bored holes, said yoke being open at one side whereby the drill steel and tool are used together without passing the drill steel in an endwise direction through the tool and permitting lateral sidewise removal of the tool from the drill steel shank, said cylindrical guide portions having openings extending therethrough for discharging the cuttings from the hole drilled by the drill steel.

5. A guiding tool for use in a boring operation, comprising cylindrical guide portions arranged in parallel side by side relation in a manner to be positioned in parallel bored holes, and a yoke extension formed integral with and extendingbetween said cylindrical guide portions for engaging the shank of a reciprocating rock drill steel for guiding the cutting end of the steel arranged between said cylindrical guide portions and used in boring an adjacent overlapping hole tension being open at one side whereby the drill steel and tool are used together without passing the drill steel in an endwise direction through the guiding tool and permitting lateral sidewise intermediate said parallel holes, said yoke exremoval of the tool from the shank, said parallel guide portions having formed on their adjacent inner sides longitudinal guideways in which the cutting end of the drill steel is slidably guided.

6. A guiding tool for use in a boring operation, comprising cylindrical guide portions arranged in parallel side by side relation in a manner to be positioned in parallel bored holes, and a yoke extension formed integral with and extending between said cylindrical guide portions for engaging the shank of a reciprocating rock drill steel, for guiding the cutting end of the drill steel arranged therebetween and used in boring an adjacent overlapping hole intermediate said parallel holes for cutting the separating core between said parallel bored holes, said yoke extension being formed to hang on the cutting end of the steel during withdrawal of the steel from the bore hole and provided with an open side so that the tool may be placed laterally sidewise on the drill steel shank without passing the drill 1 steel in an endwise direction through the guiding tool, said guide portions when in guiding relation with the cutting end of the steel cooperating with said cutting end for locking the guiding tool against sidewise removal from the :1

drill steel, said guiding tool being releasable from said locking relationship by rearward movement of the guiding tool along the steel shank and when in its unlocked position being removable as aforesaid laterally from the steel shank.

7 A drill steel guide comprising cylindrical guide portions arranged in parallel relation for slidingly guiding the cutting end of a drill steel, and an intermediate yoke-shaped connecting frame extending between said guide portions and. 

